Multiplex communications – Wide area network – Packet switching
Patent
1992-11-02
1994-11-01
Hsu, Alpus H.
Multiplex communications
Wide area network
Packet switching
370 941, 370 97, 3701101, 370112, 341102, H03M 700, H04J 302
Patent
active
053612612
ABSTRACT:
A network for transferring packet data in a frame structure, preferably mixed with isochronous data is provided. The frame structure is a continuously repeating structure, with each frame having a number of time slots. Certain ones of the time slots are available for transmitting packet data. The packet data is re-timed, e.g., by using a FIFO to output the data nibble-wise as required by the frame structure. Similar re-timing can be used for isochronous data so that the frame structure defines time-division multiplexing of the packet data and isochronous data. A four/five encoding scheme provides sufficient encoding efficiency that both the packet data and other data can be accommodated without degrading the data rate of the packet data. The encoding scheme provides extra symbols which can be used for transferring "no carrier" information, or "frame alignment" messages. Preferably, the frame structure is translated to and from a packet structure to permit the present invention to be used with previously available packet circuitry such as a media access controller and a hub repeater circuit. Latency of the FIFO can be reduced by pre-filling with packet preambles, and/or sub-latency propagation of preamble bytes, or providing special MACs which do not output preambles, and using the buffer circuitry to output preambles.
REFERENCES:
patent: 4220816 (1980-09-01), Howells et al.
patent: 4258434 (1981-03-01), Glowinski et al.
patent: 4412324 (1983-09-01), Glowinsky et al.
patent: 4530088 (1985-07-01), Hamstra et al.
patent: 4549292 (1985-09-01), Isaman et al.
patent: 4587650 (1986-05-01), Bell et al.
patent: 4637014 (1987-01-01), Bell et al.
patent: 4782485 (1988-11-01), Gollub
patent: 4845609 (1989-07-01), Lighthart et al.
patent: 4858232 (1989-08-01), Diaz et al.
patent: 4876683 (1989-10-01), Suzuki
patent: 4961188 (1990-09-01), Lau
patent: 5001707 (1991-03-01), Kositpaiboon
patent: 5007045 (1991-04-01), Tsuzuki
patent: 5065398 (1991-11-01), Takashima
patent: 5138440 (1992-08-01), Radice
Integrated PBX Systems, An NCC State of the Art Report, The National Computing Centre Limited, 1987.
ISDN Basic Rate Interface System Design Guide, Telenetworks document, Aug. 1989.
ISDN Primary Rate Interface System Design Guide, Telenetworks document, Jul. 1989.
Draft Supplement to IEEE STD 802.3 CSMA/CD Access Method and Physical Layer Specifications, The Institute of Electrical and Electronic Engineers, Inc., (Nov. 15, 1989).
Irube et al., "Integrated Information and Communication System for Business Networks", Hitachi Review, 40(3):241-247 (1991).
HMUX ERX "FDDI-II Hybrid Multiplexor" Rev. 2.4, 1991.
IBM Corporation, "Task Order", pp. 6-7, 1992.
DP8390, "Network Interface Controller: An Introductory Guide", LAN Databook, pp. 206-213, 1992.
DP83932B, "Systems-Oriented Network Interface Controller", LAN Databook, pp. 288-383, 1992.
DP83950A, "Repeater Interface Controller", LAN Databook, pp. 3-75, 1992.
DP83950EP at IEEE 802.3, Multi-Port Repeater Evaluation Kit, LAN Databook, pp. 75-87, 1992.
IEEE 802.9 Draft Standard Integrated Services (IS) LAN Interface at the MAC and PHY Layers, Institute of Electrical and Electronics, Nov. 1992.
"National Proposes Isochoronous Ethernet", Electronic News, vol. 38, No. 1940, p. 19, Nov. 1992.
"IBM's Multimedia Venture: Opportunity for its Hardware?", vol. 38, No. 1930, p. 1, Sep. 1992.
C. A. Gallagher, `IEEE 802.9: A Multi-Service Lan Interface`, Second IEEE National Conference on Telecommunications, Apr. 1989, York, GB, pp. 173-178.
P. Martini, et al., Real-Time Traffic in FDDI-II, Packet Switching vs. Circuit Switching, IEEE Infocom 1991, vol. 3, Apr. 1991, Bal Harbour, U.S., pp. 1413-1420.
F. E. Ross, et al., `FDDI--A Lan Among Mans`, Computer Communications Review, vol. 20, No. 3, Jul. 1990, New York, U.S., pp. 16-31.
Edem Brian C.
Worsley Debra J.
Hsu Alpus H.
National Semiconductor Corporation
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